Aderiva is a crossover heavy metal band from Fortaleza, Ceará, Brazil, blending hardcore and heavy metal in a style rooted in the northeastern Brazilian underground rock scene. Active since 1999 in various forms and revived under the Aderiva name around 2015–2016, the band released the EP "Vida Longa e Próspera" in 2016 and the full-length "Auto Evolução", the latter celebrating 20 years of the group's history.

Adrammelech is a black metal horde from Joinville, Santa Catarina, Brazil, formed in 2018 and oriented around themes of primordial gnosis, war, and Hyperborean mysticism. The five-piece — operating under pseudonyms including Masterwolf, Daswolf, Hades, and Terror — released a self-titled demo in 2018 on Battlefront Distro.

Adriano Arguelho is a shred and heavy metal guitarist from Campo Grande, Mato Grosso do Sul, Brazil, operating as a solo project since 2022. Drawing on the tradition of Brazilian instrumental guitar, the project emphasizes technical, high-speed fretwork rooted in heavy metal.

Adumbrall is a black/death metal solo project from Euclides da Cunha, Bahia, Brazil, formed in 2020 by Athayde Neto, who also plays in the band Wiseblood. A one-man operation, Neto handles all instruments, vocals, and lyrics, channeling themes of nature, philosophy, enlightenment, horror, and lust across releases including "Through Passion, Through Pain, Through Blood" and "In a Blaze of Order."

Adversæ is a post-black metal and atmospheric black metal project from Rosario, Santa Fe, Argentina, that composed, recorded, mixed, and mastered its debut self-titled album entirely in Rosario in 2022. Released on August 6, 2022, the record's five tracks — including the ten-minute opener "Ouroboros" and "Enemy of Man" — blend black metal aggression with shoegaze textures and post-rock dynamics. The project describes its music as "an interpretation of the path of humans in the universe," grounding its sonic ambition in a philosophical framework.

Aeri Satur is a black metal and dark ambient project from Sorocaba, São Paulo, Brazil, active since 2023 under the creative alias Sagarana. The project blends raw and depressive black metal with dungeon synth and experimental atmospheric elements, incorporating literary references to Tolkien, Guimarães Rosa, and Florbela Espanca into its Portuguese-inflected songwriting. Their 2024 album "Vreedas" exemplifies their oneiric sound, weaving extended compositions through cosmological and philosophical themes.

Aeterna Ordo Mortis is a depressive black metal project based in São Paulo, Brazil, formed in 2023 by vocalist and multi-instrumentalist Luan Viktor. The project explores existential despair, mental anguish, and the imbalance of human existence through a raw, atmospheric DSBM sound, as heard on their 2023 debut EP "Far Beyond the Agony" — a five-track, twenty-minute descent into introspective darkness.

Aetherea is a symphonic power metal band from São Paulo, Brazil, whose roots trace back to a project conceived by guitarists Fábio Matos and Everton Coro. Drawing comparisons to Nightwish, Epica, and Angra, the band pairs soaring vocals with orchestral arrangements and technically proficient guitar work, releasing the full-length "Through Infinite Dimensions" in 2021 and the "Wheel of Fate" EP in 2025.

Aeuphoria is a technical death metal band from Del Viso, Buenos Aires, Argentina, whose five-piece lineup — featuring Gustavo Alvarez Vivar on vocals, Damian Guardo and Nahuel Gannon on guitars, Franco Fuentes on bass, and Andres Fernandez on drums — came together in 2015 and released their debut album Æthernal Velum in 2016. The record blends the clinical precision of technical death metal with atmospheric and black metal textures, drawing comparisons to both Cascadian and Scandinavian approaches to extreme music. Æthernal Velum was recorded and produced by Alejandro Olmedo and earned the band attention from international metal publications for its ambitious scope.